Universal urethane (the expensive ones) flaps with stainless hardware for a GVR4. Each flap comes with 3 bolts/washers. 2 bolts/washers are new stainless, the third is old OEM.
They bolt/screw right into the dog leg/fender shield area. Using one or two existing holes and self tapping the other ones.
On car:
http://lilevo.com/cars/gvr4rearb.jpg
http://lilevo.com/cars/gvr4frontb.jpg
Off car:
http://lilevo.com/sell/gvr4/rafront.jpg
http://lilevo.com/sell/gvr4/rarear.jpg
$100 shipped
Can be adapted to a CSM I'm sure..